import React, { Component } from 'react'
//引入store，获取redux中保存的状态
import store from '../../redux/store';
//引入action
import { createIncrementAction,createDecrementAction, createIncrementAsyncAction} from '../../redux/count_action';

export default class Count extends Component {
    //自身的状态留着，共享的暴露出去
    state = {car:  '奔驰'}

    componentDidMount(){
        //检测redux中的状态变化，变化了就用setState()方法，虚晃一枪，调用render()
        store.subscribe(()=>{
            this.setState({})
        })
    }
    //加法

    increment = ()=>{
        const {value} = this.selectNumber;
        store.dispatch(createIncrementAction(value*1))
    }
    //减法
    decrement = ()=>{
        const {value} = this.selectNumber;
        store.dispatch(createDecrementAction(value*1))
    }
    //奇数加
    incrementIfOdd = ()=>{
        const {value} = this.selectNumber;
        const count = store.getState()
        if (count % 2 !== 0) {
            store.dispatch(createIncrementAction(value*1))
        }
    }
    //异步加
    incrementAsync = ()=>{
        const {value} = this.selectNumber;
        store.dispatch(createIncrementAsyncAction(value*1,500))
    }
    render() {
        return (
            <div>
                <h1>当前计算值为{store.getState()}</h1>
                <select ref={c => this.selectNumber = c}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select>&nbsp;
                <button onClick={this.increment}>+</button>&nbsp;
                <button onClick={this.decrement}>-</button>&nbsp;
                <button onClick={this.incrementIfOdd}>addOdd</button>&nbsp;
                <button onClick={this.incrementAsync}>addAsync</button>&nbsp;
            </div>
        )
    }
}
